I will use hobbyking as example site because they have nice measure pictures and descriptions.
Let's see 3 different servos :HXT900D922MGHitec HS-65MG

See the measure table on the pages. I found that most important measurements for e325 are B and F. You can see B is 23 or 22 mm for these three and you will be able to squeeze those 23 between the grips.
F is different story. HXT900 is 16mm, D922MG is 19mm and HS-65MG is 17mm. For aileron and pitch servo (those are mounted on the sides of e325) you will not be able to fit 19mm without adding some extra distancer. You will fit 16mm. You should be able to fit 17mm as well.